Lexicon PCM90 and sysex

I am trying ot build an Editor for my PCM90.
The Lexicon’s documentation about sysex is very deep but I can’t find the right way to send a dump request to the PCM.
I managed to use the remote mode by spying the sysex sent though.

> I am trying ot build an Editor for my PCM90.
> The Lexicon’s documentation about sysex is very deep but I can’t find the right way to send a dump request to the PCM.

The documentation mentions:
MIDI Implementation Details, including System Exclusive documentation, are available to assist experienced programmers in developing software for use with the PCM 90. These can be obtained directly from Lexicon. Request: PCM 90 MIDI Implementation Details.

Do you have these implementation details? Typically dump request are done through some handshaking communication. Eg, you send a string to the device with such a request, device will say ready?, you say yes!, device says here it comes, … more?, you say yes. And so on. But this is anyhow not mentioned in the regular documentation.

>
> Do you have these implementation details? Typically dump request are done through some handshaking communication. Eg, you send a string to the device with such a request, device will say ready?, you say yes!, device says here it comes, … more?, you say yes. And so on. But this is anyhow not mentioned in the regular documentation.
>
> –
> johan
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hello Johan

yes I have the full documentation, I found the request scheme chapter, but each time I try to build the "request" message I got "sysex error" on the PCM display, if I send back a sysex message sent by PCM via MAX it works.
I could just use this technic but I need to get a complete dump of the loaded effect to display its state in my editor first.

I will do more empirical tries , maybe I will find the right string to send.